Dental apparatus.



A. JAMESGN. DENTAL APPARATUS. APPLIUATIOH FILED 001}. 25, 1907. 935,53g, Patented Oct. 12, 2999.

2 SHEETS-8533f? l.

I (ll/Homage- A. JAMESON. DENTAL APPARATUS. APPLIOATIOH FILED OUT. 25, 1907.

Patented Oct. 12,1909.

2 SHEETS-SHEET 2.

A Zaander James 021/,

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' annxannnn JAMESON, or runmnaroms, INDIANA.

DENTAL r APPARATUS.

To all whom "it may concem:

Be it known that I, ALEXANDER J AMESON, a citizen of the United States, residing at Indianapolis, in the countyv of Marion and State of Indiana, have invented certain-new and useful Improvements in Dental Apparatus, of which the following is a specification.

.The object of my invention is to produce a 'means for faoihtatin the formation ofv dental matrices, espaei; yifor the product on of metal inlays, the s'tructurebeing cs- -pecially desi'gned for use'in connection with the casting apparatusforming the subjectmatter of my pending application, Serial No.

381,+116,- but of such. use.

The accompanying drawings illustrate my course, not being limited, to

invention.

Figure l'is a perspective-view pf the apparatus embodying my present invention; Fig. 2 a side elevation showing the parts inverted for theapplication of the first or preliminary investitnre; Figf3 a sectional detail showing the complete. invetiture with the parts ready-for withdrawal of the sprue ormer; Fig. 4 a perspective detail of means for holding 'aplurality of wax casts whereby a multiplicity of castings may be made in a single investiture; Fig. 5 a sectional detail of a'multiple investiture; Fig. 6 an enlarged sectional detail of the multiple patternholde'r; Fig. 7 a sectional detail'showing a form in which the various modifications are combinedi Fig. 8 a perspective of a modified sprue, and Fig. 9 a section detail of the form shown in Fig. 8.-

In the drawings, 10' indicates' avsuitable base having a socket. 11 adapted to receive temporarily'the-investiture cup 12. Rising from the base 10 is a s andard-13 in theupper end of which is journaled a fork 14, the stem 15* of said fork pass-mg through standa'rd13 and a light spring 16 arranged thereon soas to hold the spud 14 of the fork in a corresponding groove formed in the adjacent faqerof the standard 13. Passing through fork'l l isa stem 17 which, in Figs. 1 and 2 is shown as provided with a head 18 which limits the movement of stem- 17 through fork 14. A suitable clamping screw 19 is pro- Vided by means of which stem 17 may be clamped in fork lat any desired position.

' I In 1, 2, and 3 I show stem 17 pro- .vided at one end with a sprue pattern which in general is conical with a blunt t1p v Specification of Letters-Patent. Patented @ct. 112,199}. application filed October 25, 1907. Serial No. 399,153.

1 upon which the wax-pattern 21 may be readily temporarily stuck. Referring particularly to the form shown in Figs. 1 to 3, the operation is as follows: With the parts in the position shown in Fig. 2, a preliminary plastic investiture 23 may be. readily placed by a small brush around the pattern 21. Thereupon fork 14 is turned through half a turn to the position shown in Fig. 1. The cup 12 is. then filled or nearly filled with plastic inves'tit-ure 24, such for instance as plaster of paris or any other well known composition now commonly in use among dentists. Stem 17 is then lowered through fork 14 so as to project pattern 21 and the preliminary investiture 23, and sprue pattern 20 into the plastic in the cup 12, the head 18 forming a gage for the downward movement of stem 17. The parts are allowed to remain in this position until the plastic 24: has sufliciently hardened, whereupon, by turning steni- 17 on its axis, the sprue may be readily disengaged from the pattern and plastic and withdrawn. whereupon the cup 12 with its contents is subjected to a sufiicient degree of heat to melt the wax pattern 91 and allow the wax to either run out of the investiture or be absorbed thereby in the usual well known manner. Thereupon the cavity in the investiture may be filled with molten metal '11 any desired manner.

In order to facilitate the attachment of the patterns I have provided the peculiar form shown in l to (5. In this form the sprue pattern 20 is provided at its end with a socket 263 into which are permanently fastened by solder 27 or otherwise comparatively small wires 28, the ends ofwhich are .coated with a heavy coating of wax 'lVith this form as many coated wires 28 as may be desired may be secured in the tip of the spru'e pattern 20. and the wax patterns 21 readilystuck upon the wax 29, one pattern upon each finger 2S2). Each pattern may then be separately invested in a preliminary investiturc and the whole in-.

' sprue is similar to sprue pattern'QO" which, when slightly heated, may be driven of. the operator so as to hold the patterns Y wire carried by the end of thesprue-pattern fthe fingers 30'will serve to trim any surplus 3 10.

'til the preliminary investitur'e has been 1 adapted to receive and support an investi- -movable therein both axially and rotatively,

pattern and having a fusible-coating to may be moved toward and from the investivby said base, an arm rotaiably mounted in v 5. A dental apparatus comprising an invvestiture cup, a sprue pattern having. an

which it may be moved toward and from the the larger wax coating and these channels formed by the members 28-29 form sprue passages to theseveralcavities.

If desired, in order to. make a neat job quickly, the sprue pattern may be provided with cutting fingers 30 which extend across I the top of the cup 12 so that, when the stem 1 17 and attached sprue pattern are rotated, I

from the upper end .of the plastic 24.

In the form shown-in Figs. 8 and 9, the

except that it has a central'bore 35'. In the use 'of this sprue pattern I take a fine wire 36 and double it so as to form a loop 37 into the pattern 21 and the wire then passed through the bore 35 and held by the fingers 21 against the tip of the sprue pattern unplaced about it. The wire 36 then may readily be withdrawn or allowed to remain until the final investiture and removal of the sprue pattern. 1

I claim as my invention: g 1. A dental appa-rhtus comprising a .base

ture cup, the said cup, a standard carried by said base, an arm rotatably mounted in said standard, and a sprue pattern having a stem slidably mounted in said arm, substantially as described.

2. A dental apparatus comprising a support, a stem mounted in said support and aspruepattern axially mounted on said stem, a wire carried by the end of the spruewhich a fusible pattern may be stuck, and an investiture cup to cooperate with said sprue-pattern. v 3. A dental apparatus comprising an in vestiture cup, a sprue pattern having a stem, a support for said stem through which it ture cup, and a wire carried'by the end of the sprue-pattern and having a fusible coating to'which a fusible pattern maybe stuck.

4:- A dental apparatus comprising a base adapted to receive and support an investiture cup, the said cup, a standard carried said standard, a sprue pattern having astem shdably mounted 1n. 511d arm, and a' and having a fusible coating to which a fusible pattern may be stuck:

axial stem, a-support for said stem through investiture cup in which-it may 'be rotated, cutter arms carried by the sprue pattern near its outer end and adapted to extend across the mouth of the investiture cup..

6. A dental apparatus comprising an investiture cup,- a sprue pattern having astem,

a support for said stem through which it 1 may be moved toward and from the investiture cu'p, cutter arms carried by the sprue pattern near its outer end and adapted to extend across the mouth of the investiture body with a transversely extending cutter near its base. 1

9. In a dental apparatus, a sprue pattern comprising a main substantially conical body. an axial stem by means of which it maybe rotated, and a transversely extend-.

ing cutter at the base of the sprue pattern. 10. In a dental apparatus, a sprue pattern --comprising a substantially conical main body, and a wire extending from the apex thereof and coated with a' fusible coating.

11. In a dental apparatus, a sprue pattern comprising a substantially conical mai; body and a plurality of divergent wires detachably mounted in the apex of the mainbody and each coated 'with a fusible-coatii to which patterns may be stuck.

- 12. In a dental apparatus, a spruepattern comprising a substantially main conical i body having a longitudinal-bore,'and a wire doubled upon itself'and having its doubled portion passed-through the bore of the sprue pattern and projecting from the small end thereof for the purpose set forth.

13. In a dental apparatus, a sprue pattern comprising 7 a substantially 'niain conical body having a longitudinal bore, and a holding wire extended through said bore and withdrawableoutwardly therefrom and having an end adapted to be inserted into a pattern, for the purpose set'forth.

In witness whereof, I have hereunto set my hand and seal at Indianapolis, Indiana, this twenty-first day of October, A. D. one thousand nine hundred andseven. a ALEXANDER JAMESON; [n 5.]; Vitnesses:

' ARTHUR M. Hoon,

THOMAS IV. MOMEANs. 

